Assessment Of Eco-geological Environment Qality In Luding Base On GIS And RS

LuDing County, which is located in the transition zone between western Sichuan plateau and Sichuan Basin, belongs to high canyon landscape. And it mainly develops agriculture, forestry and animal husbandry. In the recent years, geological disasters have occurred very often because of over-agricultural reclamation, over cut and herding. So the ecological environment becomes so weak that it will be very hard to recover if it is destroyed. At present, the geological environment evaluation will be the basis of making scientific decision on exploiting agriculture,forestry and land-resource.First, the thesis regards GIS as a method to manage environmental geology space database and Spatial Analysis. Second, it picks up some environmental data by using remote sensing data. Thirdly, it uses multidisciplinary knowledge, such as geography, geology and ecology and combines evaluation theory and method of Ecological and geological environment to evaluate. The achievements obtained are below:(1) Basing on analyzing multi data of topography, hydrology, geological structure and precipitation, formation litho logy as well as geological disasters, soil and ETM remote sensing image, and unifying them under the same coordinate system by using GIS, geological environment information, such as heights, grades, basin distribution and soil will be collected.(2) Basing on analyzing the general situation of geological environment, the main Ecological environment geology problems will be revealed in LuDing County. And environmental effect caused by environment geology problems, such as geological disaster, soil erosion, and seismic activity are analyzed and present evaluation of Ecological geological environment will be made. (3) Using the ultimate principles of evaluating Ecological geological environment and taking successful experiences of Ecological geological environment ratings done by predecessors as examples, combining the actual situation of ecological geological environment of LuDing county, the patterns of Ecological geological environment can be divided into agriculture and forestry respectively. Select evaluate factors, whose system of evaluation are built respectively, and use AHP to calculate the weights of the two patterns of Ecological geological environment and build a fuzzy comprehensive estimation model and carry on quantitative evaluation in every zone.(4) According to the result of quantitative evaluation on ecological geological environment, and combining with topography, climate differentiation characteristics and distribution characteristics of agricultural economic activities, evaluation sub regions, whose Ecological geological environment qualities are evaluated, are delimited relevantly.